\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usepackage{wasysym}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,xscale=0.6]
  % \useasboundingbox(0.9,0)rectangle(5.1,5);
  % \foreach \x in {0,-3,-6}
  % {
  \draw [<->](0, 2)node[left]{$i$}--(0,0)--(14,0)node[right]{$t$};
  \node at (-.25,.25){$O$};
  % }
  \draw [ultra thick] plot[domain=0:4*3.1416, samples=1000] function{sin(x)+1} ;
  % \draw [ultra thick] plot[domain=0:4*3.1416, samples=1000] function{sin(x)-6} ;
  % \draw [ultra thick] plot[domain=0:4*3.1416, samples=1000] function{-2} ;
\end{tikzpicture}
\end{document}